112 Orthorrhapha brachycera. 



then over the outermost base of the discai cell to end at the alula. 

 Costa with black hairs at the base, and with yellow, scaly hairs 

 above. Squamulæ with a whitish fringe; frenulum yellow haired. 

 Halteres brown, the knob whitish yellow. 



Female. Agreeing with the male, but the vertex and frons con- 

 siderably broader. 



Length 4—10 mm. 



A. afer is very rare in Denmark, I only know of seven specimens, 

 one from an earlier date, without particular locality, and six taken 

 on Bornholm at Hasle in July (H. I. Hansen, Schlick.). 



Geographical distribution: Europe down into Spain and Italy; it 

 seems to have its northern limit in Denmark. 



4. A. occultus Meig. 



1820. Meig.Syst.Beschr.il, 153,19. — 1840. Low, Isis 1840,533.- 

 1862. Schin. F. A. 1, 51. — 1903. Kat. palåarkt. Dipt. II, 179. 



Male. Shape somewhat slender. Black; frons with erect, black, 

 and some depressed golden hairs; epistoma with black and yellow 

 hairs; occiput with sparse, depressed yellow hairs, a short, yellow 

 fringe at the hind margin. Antennæ black, the basal joints with black 

 hairs; the third joint tapering evenly into a thin, styliform part. 

 Thorax on the disc with black, scaly hairs, and sparingly clothed with 

 erect, black hairs; at the front end the hairs are yellow and form a 

 somewhat dense fringe all round which is blackish brown below. 

 Pleura with long, yellow^ hairs which are dense above; metapleura 

 with a vertical tuft of yellow hairs. Abdomen with parallel sides; 

 covered with black, scaly hairs and some yellow hairs, especially at 

 the front margin of the third and at the hind margin of the fifth and 

 sixth segments; it has two white or whitish yellow, transverse hair 

 bands, one at the front margin of the second, the other at the front 

 margin of the fourth segment; the seventh segment is also whitish 

 yellow haired; in addition the abdomen is clothed with somewhat 

 long, black hairs; the hairs at the margin longer and somewhat 

 fringe-like, at the sides of the first segment white, and likewise at the 

 side of the second and fourth segments in connection with the white 

 bands. Venter with long, black hairs, at the base some pale, and 

 covered with black, scaly hairs; the fourth segment more or less 

 covered with white, scaly hairs. Legs black or brownish, all hairs 

 and bristles black ; the front tibiæ with bristles. Wings blackish brown 

 on the anterior half, about to the apex, but the border towards the 

 posterior, hyaline part quite effaced. Costa with black hairs at the 



